The agency is looking to determine if there were violations of workplace safety standards, Fitzgerald said.

"It's too early to estimate a completion date for the inspection," Fitzgerald said recently. "However, OSHA inspections must be completed within six months."

"If the inspection identifies violations, then citations could be issued to and fines proposed for the employer," Fitzgerald said. "It's too early to estimate a completion date for the inspection, but it could take some time."

Pioneer owner William Papale has said Fera is a longtime employee, and Henry has been working for Pioneer about a year, Papale said.

Police, fire, and EMS responders went to the scene after multiple 911 callers had reported a house explosion. The house was on fire when emergency units responded.

Wopowog Trail is between Long Hill Avenue and Far Mill River Park. An online real estate website shows the house is 2,248 square feet, with three bedrooms and three bathrooms on a quarter-acre wooded lot.